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Sliding ladder applet

Sliding ladder problem An 8m ladder is leading against a wall. The foot of the ladder begins to slip away from the wall at a constant rate 0.5ms-1 Does the ladder slip down the wall a) At a constant rate of 0.5ms-1 b) At a constant rate less than 0.5ms-1 c) At a constant rate more than 0.5ms-1 d) None of the above answers?